paul-rogers commented on a change in pull request #2026: DRILL-7330: Implement
metadata usage for all format plugins
URL: https://github.com/apache/drill/pull/2026#discussion_r392607531
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/base/AbstractGroupScanWithMetadata.java
##########
@@ -634,6 +642,62 @@ public NonInterestingColumnsMetadata
getNonInterestingColumnsMetadata() {
return nonInterestingColumnsMetadata;
}
+ /**
+ * Returns {@link TableMetadataProviderBuilder} instance based on specified
+ * {@link MetadataProviderManager} source.
+ *
+ * @param source metadata provider manager
+ * @return {@link TableMetadataProviderBuilder} instance
+ */
+ protected abstract TableMetadataProviderBuilder
tableMetadataProviderBuilder(MetadataProviderManager source);
+
+ /**
+ * Returns {@link TableMetadataProviderBuilder} instance which may provide
metadata
+ * without using Drill Metastore.
+ *
+ * @param source metadata provider manager
+ * @return {@link TableMetadataProviderBuilder} instance
+ */
+ protected abstract TableMetadataProviderBuilder
defaultTableMetadataProviderBuilder(MetadataProviderManager source);
+
+ /**
+ * Compares the last modified time of files obtained from specified
selection with
+ * the Metastore last modified time to determine whether Metastore metadata
+ * is not outdated. If metadata is outdated, {@link MetadataException} will
be thrown.
Review comment:
"is not outdated" --> "is current" or "is outdated"
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